Dynamo-electric direct-current generator



R. BOINl DYNAMO-ELECTRIC DIRECT CURRENT 0R. APPLlc/mou msn ocT. 4. 19x

"11,433,597, 1 mma ont 31,1922

SHEET I.

Amway R. BOIN. DYNAMO-ELECTRIC DIRECT CURRENT GENERATOR. .l l APPLICATION FILED 0CT.4. 1918. 1,433,597. Patend 06u31,1922

2 SHEETS-SHEET 2.

N c e .a I /li Patented Oct. 3l, 1922.

ROMAINBOIN, 0F ARGENTEUIL, FRANCE.

DYNAMO-ELECTRIC DIRECT-CURRNT GENERATOR.

Be it known that I, ROMAIN Bom, a subject of the Kin of Bel ians, and resident of Argenteuil, eine et ise, France (postodice address 22 Route de Sannois), have invented new and useful Improvements in Dynamo-Electric Direct-Current- Generators, which improvements are fully setforth in the following specification.

The present invention has reference to direct current dynamo-electric machines; and it resides in the provision of certain improvements hereinafter fully described. relating primarily to the construction and arrangement both of the pole pieces which are comprised in the inductor in such a manner :if-s to provide a variable gap, as well as of the armature, the object being to subject the successive members of the armature to a progressive variation of the flux.

ln the accompanying drawings, Figures l and 2 are, respectively, an end view and a. vertical section of the improved machine, and l? ig. 3 is a view showing a modified form of pole-piece.

Referring more particularly to the drawing` indicates the shaft of the machine. the inductor fixed thereto, and c the pole pieces, In the construction disclosed in Fig. l.` the pole-pieces are (':rescent-shaped and` by reason of that fact, produce a variable or graded air gap and, hence, a corresponding variation of the iux; but instead of being given that shape. however` they may have the form represented in Fig. in which their ends are tapered in width in order to obtain the desired variation of the flux, the pole-pieces themselves being arranged concentric with the armature.

The latter is composed of a ring or circle of members d disposed externally of the inductor, each member including a core d2 surn rounded by a winding d', which windings are connected in series and suitably insulated. The ends or terminals of the windings are connected to the insulated segments c of the commutator, which is engaged by the brushes f and, as shown` is disposed interiorly of the armature and concentric with the shaft o. The cores (l2 lie parallel with the said shaft and are attached at one end to separate pole pieces d3 adjacent the inductor, and at the other end to a ux-conducting ring (Z4. The inductor may be magnetized either permanently or electromagnetically. Current is supplied from the Application led October 4, 1918.y Serial No. 256,845.

brushes f through conductors f2 to s1ip-rings Aaction `being obtained, as usual, by setting up a rela-tive rotary movement between the armature and the inductor. Either of these two companion parts may be rotated, and the other part left stationary; but in the construction illustrated, it is the inductor to which the rotary movement is imparted and which, accordingly, is fixed to shaft a to be rota-ted thereby, the brushes f likewise being connected with the shaft by means of a suitable supporting device During this rotation, the armature windings are subjected successively to a maximum flux of one polarity. a neutral point, a maximum flux of opposite polarity, and a second neutral point, thereafter repeating the cycle.

The arrangement of the armature windings is such that, contrary to what is usually the case in dynamo-electric machines, where the windings of sections of very different voltages cross one another and are in actual contact. the insulation of each coil from the next one is highly desirable and can readily be effected, since the windings of cach coil can be completely insulated from those of the adjacent coil and from the metallic parts of the machine. Relatively high voltagesmay thus be generated in each coil without danger of short circuits.

It will be apparent that the improved machine may readily be utilized as a motor, in which case the inductor, instead of being .driven by means of mechanical devices, will be rotated by electric current which is supplied to the arma-ture windings through the brushes.

When used as direct current generators, machines of the character described have various applications, and are especially suitable for supplying the high-tension currents required in X-ray machines of the Coolidge type.

I claim as my invention l. ln a direct current dynamo electric machine, the combination of an inductor having symmetrical.l elliptical pole-pieces with a variable air gap; an armature comprising an annular assemblage of windings, and a. core for each winding, said windings encir cling the inductor and disposed concentrically therewith and parallel to the axis of the/machine and being connected in series; a flux-Conducting ring; t0 which the cores of the windings are attached, said ring and indiietor having a Common axis; a Commutator haring' insulated segments to which the windings are attached; and brushes bearing against the oomImitator.`

2. ln a direct Current dynamo electric machine7 the combination ot a rotary shaft; an indnetor fixed t0 the shaft to rotate there- With and having elliptical pole-pieces with, :i variable air gap; a stationary armature Comprising' an annular assemblage of Windings7 and a core 'for each vvinding` said Windings encircling the inductor and disposed eoncentrieallv tlierewith and parallel to said ln testimony whereof I have signed this 'v speeication in the presence of two subscribing Witnesses.

Roi/inni Boni.

fit-messes r I JOHN F. Srivromis, B. M. GIOTTI. 

